6 Suggested Answers

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If the dome light is the only circuit supplied by that fuse the sensible place to check for shorting wires is in the light fitting itself and if nothing is found work backwards to the fusebox.

Discovering where the short is on a single wire can be a massive task if it is in the wiring harness and it is often simpler to cut the offending wire at both ends and fit new, unfortunately it is unlikely the dome light is the only accessory supplied by that fuse. Referring to a wiring diagram before you start cutting should make things clearer - I hope it is something obvious in the dome light or accessible wiring...

youd need the NPR heavy truck, FSM book page on radio wiring
buy book at any Isuzu heavy truck dealer.
we dont now what radio option cam on that NPR
nor what country , other countries use different radios.
so..... this is USA forum, and we dont have NPR books.

this is no heavy truck forum. its only light and cars.
NPR what, (the number)
and what engine? fuel parts match up to and engine.
no year NPR. wow. and have gas or diesel engines.
no fuel stated either.
NPR started in USA in 1985 (this is USA forum)
this?